BaseVoice Communications Server:

The BaseVoice Communications Server is a J2EE-based SIP Server that functions as a Proxy, Registrar and Presence Server.

It includes a web interface, allowing for easy administration, and uses a database back-end for persistance. Used successfully as a registrar service for enterprise telephony systems, proxying to soft-switch and hardware PSTN gateways and as an Intranet collaboration system for distributed development teams.